Electrochemical Performance of LiTa₂PO₈-Based Succinonitrile Composite Solid Electrolyte without Sintering Process.

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Solid-state batteries (SSBs) offer advantages over lithium-ion batteries (LiBs) like higher energy density and safety.
• Challenges in SSBs include poor interfacial properties of solid electrolytes and high-temperature sintering requirements.
• Current limitations hinder the commercialization of solid-state battery technology.

Purpose of the Study:

• To enhance the interfacial properties of lithium tantalum phosphate (LTPO) solid electrolytes.
• To improve ionic conductivity of LTPO by incorporating succinonitrile (SN) at the particle interface.
• To enable solid electrolyte fabrication without high-temperature sintering.

Main Methods:

• Preparation of a succinonitrile (SN)-containing lithium tantalum phosphate (LTPO) composite electrolyte.
• Electrochemical impedance spectroscopy (EIS) to measure ionic conductivity.
• Lithium symmetric cell and galvanostatic cycle tests to evaluate performance and stability.

Main Results:

• The SN-containing LTPO composite electrolyte achieved a high ionic conductivity of 1.93 × 10^-4 S/cm at room temperature.
• Demonstrated good cycle stability and low interfacial resistance with lithium metal.
• Confirmed electrochemical stability of the composite electrolyte.

Conclusions:

• Incorporating SN and lithium salt effectively improves solid electrolyte performance.
• Succinic nitrile (SN) facilitates the fabrication of solid electrolytes without high-temperature sintering.
• This approach offers a promising pathway for developing advanced solid-state batteries.